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It is known that birds descended from theropod dinosaurs, whose features, especially walking, animals took from them. However, there are differences: the hind limb of birds is more bent, and they move because of bending at the knee. Dinosaurs had to move by retracting the hip. To create the gait of dinosaurs in modern birds, scientists conducted a curious experiment. They raised three groups of chickens with four individuals in each. In the experimental group, chickens were put on artificial tails from the second day after birth, which had a mass of about 15% of the animal's weight. This distribution of mass was probably also observed in theropods. The other two groups were controls: four chickens remained unchanged, and four more scientists weighted the body by 15%, adding a load on the back. The researchers wrote that they paid special attention to how convenient it is for birds to exercise. It turned out that the chickens that were in the experimental group got used to their tails pretty quickly and showed no signs of discomfort. At the age of 12 weeks, the gait of all the birds was captured on camera and analyzed. It turned out that in animals that have been wearing an artificial tail since birth, the structure of the leg bones is seriously different from the control groups and is very similar to that characteristic of theropods. The researchers said that with the help of such tails, it is possible to study the gait of dinosaurs on birds.
3 года назад
A doctor's dilemma
Nowadays medicine is developing by big steps. New opportunities for the treatment of patients, new medicines and devices are increasingly emerging. But often medical workers find themselves in difficult situations when they need to apply their skills in full force and gather their courage. For example: there are 6 patients in the ward who require prompt treatment, but there are no organs for 5 people in the hospital, but the sixth person needs urgent medicine, as he is in a near-death state. What would I do in this situation? After thinking a little and understanding the situation, a plan was made in my head how to help the sick...
3 года назад
Kalyzin Kalyazin is a superb town, however it is small and not so popular. Still the nature here is wonderful, and the sunsets are excellent. Obviously you can walk all day in kalyazin and look at sightseen,because there are enough museums in this place. For example( Volgari Museum, Kalyazinsky local History Museum). Surprisingly but there is a Baba Yaga estate here. There is also a church of the Ascension of the Lord. Clearly that the main thing in this place is a flooded bell tower. This building so impressive. The best and fastest way to get from Dmitrov to Kalyazin is by train, the road will take 6 hours and will cost 1000-1800 rubles. This is not very expensive and to my mind it the most awesome option. In Kalyazin, you can stay in cottages or forest houses for a couple of days, in my opinion it is cheap,because for one night you would pay about 2 thousand rubles in a good hut. In brief,Kalyazin is a unique town with astonishing history. Here you can relax and filled with the energy of this place.
3 года назад
Kalyzin Kalyazin is a very beautiful but not so popular and small town. But the nature here is wonderful, and the sunsets are excellent. I think you can walk all day in kalyazin and look at sightseen, there are museums in this place( Volgari Museum, Kalyazinsky local History Museum). It's funny that there is a Baba Yaga estate here. There is also a church of the Ascension of the Lord. But the main thing that is in this place is a flooded bell tower. The best and fastest way to get from Dmitrov to Kalyazin is by train, the road will take 6 hours and will cost 1000-1800 rubles. This is not very expensive and i think it the most wonderful option. In Kalyazin, you can stay for a couple of days in cottages or forest houses for a couple of days, but as for me it is not very expensive, for one night from 2 thousand rubles in a good hotel. As for me, Kalyazin is a wonderful place where you can stay for a couple of days.
3 года назад